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Cod sursa(job #31621)
#include<fstream.h>
int t, n, sc;
int uc(int x)
{
int i, y, u=0;
i=1;y=x%10;
for (i=1; i<x; i++)
{
y*=x;
y=y%10;
}
u=y;
return u;
}
int main()
{
int i, j;
ifstream in("cifra.in");
ofstream out("cifra.out");
in>>t;
for (i=1; i<=t; i++)
{
in>>n;
sc=0;
for (j=1; j<=n; j++)
{
sc+=uc(j);
if (sc>=10) sc=sc%10;
}
out<<sc<<'\n';
}
in.close();
out.close();
return 0;
}